This national kendo champion is
a 9th grader at Hontsuru Jr.
High and lives with his mother.
He is the son of Ryujoji Amon
(deceased) and an ancestor of
Ryujoji Daigo, arch enemy of
Yagyu Jubei. He has a twin
brother, Hajime, who was
abducted when they were infants.
"Shiro" means fourth child, but
he feels it is inappropriate
because he and his brother are
identical twins. Shiro falls in
love with Jiyu, first for her
looks and later for her
personality. However, when he
found out that she was also
Yagyu Jubei II, has a tough
decision between carrying his
family legacy of hatred towards
Yagyu Jubei or following his
heart.
 
After his brother is freed from
being of Taiko Daiyu, Shiro
becomes possessed and turns
into Dark Shiro. Dark Shiro
possess the nationally
recognized fighting skills of
Shiro and the anger of Taiko
Daiyu. These two elements cannot
be good for our hero Jiyu.